(19)
(11) EP 0 600 732 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.01.1995 Bulletin 1995/01

(43) Date of publication A2:
08.06.1994 Bulletin 1994/23

(21) Application number: 93309632.3

(22) Date of filing: 02.12.1993
(51) International Patent Classification (IPC)5: H04M 3/42, H04L 9/00
(84) Designated Contracting States:
DE GB SE

(30) Priority: 03.12.1992 US 984802

(71) Applicant: AT&T Corp.
New York, NY 10013-2412 (US)

(72) Inventors:
  • Glassmacher, Joseph Francis
    Mercer County, New Jersey 08550 (US)
  • Greene, Joseph Michael
    Northampton County, PA 18064 (US)
  • Kester, Martin Russel
    Morris County, New Jersey 07840 (US)
  • LaCava, Joseph Louis
    Monmouth County, New Jersey 07722 (US)

(74) Representative: Watts, Christopher Malcolm Kelway, Dr. et al
AT&T (UK) Ltd. 5, Mornington Road
Woodford Green Essex, IG8 0TU
Woodford Green Essex, IG8 0TU (GB)


(56) References cited: : 
   
       


    (54) Copy protection of software for use in a private branch exchange switch


    (57) An inexpensive software copy protection arrangement prevents the unauthorized use of customized software for a private branch exchange switch. The arrangement employs a process which recognizes the signature of typical unauthorized activities and freezes the administration capability of the private branch exchange switch when such signature is detected. By freezing the administrative capabilities, the addition, removal or change of an administrative port, extension or routing pattern on the private branch exchange switch is prevented.






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